In two cases of partial closure of an epiphysial plate causing angular deformity, one of a finger and one of the lower end of a femur, the deformities were corrected by growth after resection of a small peripheral bone bridge and its replacement with a free transplant of fat. This procedure has a firm basis on experimental work. Thus, when part of a growth plate in the rabbit is destroyed but the formation of a bone bridge uniting epiphysis and metaphysis is prevented, the destroyed part is replaced by regeneration of cartilage from the adjacent parts of the plate. Moreover, it has been proved in rabbits that when a bone bridge is induced and later resected and replaced with fat, recurrence of the bridge can be prevented and subsequent growth may correct the deformity.

1. By unilateral resection of the posterior ends of the sixth to eleventh ribs including the costal parts of both costo-vertebral joints, progressive scoliosis can regularly be provoked in young rabbits. Rotation of the vertebrae is prominent in the experimental deformity.

2. Although severe progressive scoliosis can be provoked by a surgical procedure we do not yet know the deforming forces which are released by the operation, but the way lies open for accurate studies on these factors.

3. It seems possible that studies on experimental progressive scoliosis may provide us with new methods to counteract or cure scoliosis in children. The goal is a means to reverse the deforming forces during growth so that the child's spine is straight when growth ceases.